> Now, will they fly this one again?

Probably not. For starters, Elon has said they only intend to get a few flights out of the Block 3 rockets. Additionally, the CTO of SES said Gwynne promised them some bits of the rocket for posterity.

The Block 5 rockets (to fly later this year) are the ones Elon expects to fly more or less indefinitely, with regular servicing and part replacement.